Have you ran your car on different dynos-What did you get??

[Janner_Sy]

you hear alot about the dyno lottery when it comes to power figures and different dynos.

Got this idea after reading DomT's signature

his Ed30 made(hope he doesnt mind)

345bhp 364Ibft on an MD mustang dyno
368bhp 352Ibft on a maha dyno
322bhp 320Ibft on a dyno dynamics

thats an average of 345bhp 345Ibft  (thats a pretty good average)

which one is the most accurate  is anyone guess

We might be able to pick up a trend as to what your car could achieve on other rollers.

Any body else have figures to add. could be interesting

[GTIjames]

they are all a lottery just dont read to much into it...

unless your are massively down on power then you know you have some problems

thats the whole point of these dynos so you can test your car in a controlled environment rather than exceeding the speed limit on roads - plug in vagcom and look at the graph to make sure everything is running well if not then at least you are aware and can have it looked at

the power numbers differ so much between them due to loads of factors not just air temp but also with how much force the car is strapped to the rollers with, the person running it on the dyno,  these are just a few

just use it as a guide to how much power you car is giving out

[Janner_Sy]

more than happy with how my car is running!!

im just interested to see what dyos read what as a comparison.   If correction factors are entered corectly then how tight its strapped or air temp, air pressure etc shouldnt make a difference

[GTIjames]

have a read of this, yes its by jkm who's dynos are a little more conservative than most but explains how they work well

http://www.jkm.org.uk/performance/dynotesting.htm

[Janner_Sy]

have read that. interesting read. I for one rate the dyno dynamics.

as the 1st post states im just interested to see what peoples cars have made on different makes of dyno's. to see if certain dynos consitantly over or under read etc.

its merely an interest thing

[TDIfurby]

I have an inbuilt trust of dyno dynamics RRs.  I've never felt like I have had a reliable reading at one that wasn't.  Tried Maha and others.  A lot of it also comes down to the operators and most tuning places that know their stuff will go for the DD roads.

[Janner_Sy]

I agree. but stll it would be good to have a comparison of how much they differ to other dynos on average

[Golfgirl]

I ran mine on Stealths rollers and got 260bhp, then ran it on JKM's and got 228 bhp (car was standard on both of them)

[Janner_Sy]

ed 30/GTI. what roller does stealth use?

[TDIfurby]

There's a "TDI" dyno day in march that I am going to, which uses a DD road.  Another tuning place down the road has offered to dyno 5 of the cars F.O.C for comparative purposes.  I am hoping mine is chosen as one of those five so I can get two dynos on the same day.

[robern2]

Its an interesting subject which always generates a certain degree of controversy.
My general information post about the merits of the revo stage2+ upgrade on another forum turned into something of a discussion about the flaws of dyno X and the constraints of the K04 turbo.
Relative numbers would be good if it could be proved they were relative but with so many variables/roller brands it's always somewhat subjective.

[RedRobin]

....

I agree very much with what GTIjames has posted - Rolling-roads are essentially a diagnostic/monitoring tool and what's most important is the shape of plotted curves and data relative to different sessions on the same car.

So, for example, I regularly (all year round) plot around 240bhp/400Nm on the same rollers (JKM's Dyno-Dynamics) and so I'm far more interested if any changes occur there than seeing 270bhp on other rollers (Superchips Maha).

I see a rolling-road meet as lighthearted good fun willy-waving, but I'm experienced enough to know and enjoy what my willy does and I don't need to wave it  

[edd666999]

are hub dyno's any more/less accurate?

[Janner_Sy]

im not disputing that guys, my car @stage 1 on 3 seperate dyno dynamics rollers placed 241bhp 249Ibft give or take about 2bhp and 3Ibft.

I tend to sway more towards the dyno dynamics rollers for accuracy. I also agree on using the same dyno for consistancy.

But thats not the reason i started this thread. I purely want to see if we can get some sort of trend of how some dynos read in comparison to others.

[RedRobin]

But thats not the reason i started this thread. I purely want to see if we can get some sort of trend of how some dynos read in comparison to others.

....Which is why I posted 240 neddies on Dyno-Dynamics (JKM) and 270 on Maha (Superchips). I actually visited James at Superchips later to try to understand why there were differences for my car's plots but it got a bit technically over my head and I've come to the conclusion that each rolling-road operating business has its own justification for what they do. Consequently I find comparisons on the same rollers with same operatives (as Dom and others have said) to be far more meaningfull and the rest is just an excuse for a fun meet.

I'm looking forward to next weekend's r-r meet but won't be too bothered what the number of neddies are.